Analysis of the use of the Mach-Zender coupler in demodulating multiplexed fiber optic signals
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Authors
Wehner, Paul W.
Subjects
fiber optic signal demultiplexing
mach-zender coupler
mach-zender coupler
Advisors
Ha, Tri T.
Date of Issue
1997-09
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Fiber optic communications are the future of U.S. Navy shipboard communications. They present tremendous bandwidths with no susceptibility to electro magnetic interference (EMI) and outstanding signal to noise ratios. Current technology uses Wavelength Division Multiplexing (WDM) to allow multiple users on a single fiber simultaneously. The optical filters necessary to demodulate the WDM signal can be expensive. A less costly alternative could be achieved if Hadamard-Walsh Code Shift Keyed (CSK) encoded signals were used. An optical receiver was proposed, using the Mach-Zender coupler, capable of demodulating a Hadamard-Walsh CSK encoded signal. Building on previous work studying the characteristics of the Mach-Zender coupler, a relationship between the probability of bit error and signal-to-noise ratio (SNR) was developed for a single user and a DPSK optical signal. This relationship was then used to develop an understanding of the bit error rate to SNR relationship for a multiple-user CSK optical signal. Using the theoretical performance as a guide, a MATLAB model was then constructed to investigate the sensitivity of the receiver to non-ideal components
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funding
Format
viii, 59 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.